This method is very prone to problems. If the doorman of a general company signs for something, there is no problem with the surveillance video, and he also knows where the problem lies. If there is no problem, it will be difficult to investigate the responsibility. Who said that the signer left a note and signed it, but the signature was not his own name? How do you hold this responsibility? The courier testified? What does a story do? Are you sure he signed it once?